[geezer#99]

If you jack the motor up a couple inches it will come out. Be mindful of the distributor cap and the bottom rad hose.
I slide a 2x2 between the mount and tower to give enough room.
Sometimes you need to hand crank the motor over enough to swing the front rod journal up out of the way.
And always remove the negative battery cable. No sparks wanted.
With an old or new pan I’ve got in the habit of installing them dry. Just bolted on lightly at the four corners. Put a small flashlight inside the pan and you’ll easily be able to see any gaps on the sides and how parallel the gap is on the ends.
I’ve had stock and aluminum pans not fit well.
At least with steel you can wack them back into shape.